The binary equivalent of 406 in base 10 is

110010110

To convert a decimal number to binary, you can follow these steps:

Step 1: Divide the decimal number by 2 and write down the remainder.

406 ÷ 2 = 203 remainder 0

Step 2: Divide the quotient from the previous step by 2 and write down the remainder.

203 ÷ 2 = 101 remainder 1

Step 3: Repeat Step 2 until the quotient becomes 0.

101 ÷ 2 = 50 remainder 1
50 ÷ 2 = 25 remainder 0
25 ÷ 2 = 12 remainder 1
12 ÷ 2 = 6 remainder 0
6 ÷ 2 = 3 remainder 0
3 ÷ 2 = 1 remainder 1
1 ÷ 2 = 0 remainder 1

Step 4: Write down the remainders in reverse order. This will be the binary equivalent of the decimal number.

406 in base 10 is equal to 110010110 in binary.